List of Listings

Chapter 2. Hello, World Wide Web of Things

Listing 2.1. Polling for the temperature sensor

Listing 2.2. Polling and displaying a sensor reading

Listing 2.3. Connecting to a WebSocket and listening for messages

Listing 2.4. Register to a WebSocket and get real-time temperature updates

Listing 2.5. Simple HTML form to send a command to an actuator

Listing 2.6. Send an HTTP POST with JSON payload from a form

Listing 2.7. A basic device browser

Listing 2.8. Retrieve and parse device metadata using AJAX JSON calls

Listing 2.9. Mashup function

Chapter 3. Node.js for the Web of Things

Listing 3.1. A Hello World HTTP server in Node.js

Listing 3.2. A simple HTTP server returning JSON data

Listing 3.3. A simple package.json file

Listing 3.4. operations.js: a mathematics module in Node.js

Listing 3.5. A simple Node application using the operations module

Listing 3.6. An asynchronous call to the database

Listing 3.7. Using the request library

Listing 3.8. A mashup with asynchronous calls leading to a “callback hell”

Listing 3.9. A mashup with asynchronous calls and named callbacks

Listing 3.10. Using async.series for serial control flow

Listing 3.11. Using a control flow library

Chapter 4. Getting started with embedded systems

Listing 4.1. Modifying the Wi-Fi configuration file

Listing 4.2. Pinging your Pi

Listing 4.3. Connecting to the Pi using ssh

Listing 4.4. Installing Node.js on your Pi

Listing 4.5. Configuring GitHub on the Pi and forking the project